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Search Results: 1 - 10 of 551319 matches for " Célia R.R. de;Costa-Leonardo "
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Comportamento intra-específico do cupim Heterotermes tenuis (Hagen) (Isoptera, Rhinotermitidae) em condi??es de laboratório
Camargo-Dietrich, Célia R.R. de;Costa-Leonardo, Ana Maria;
Revista Brasileira de Zoologia , 2000, DOI: 10.1590/S0101-81752000000200013
Abstract: groups of heterotemies tenuis (hagen, 1858) from five infestation points were paired in bioassays to investigate the intercolony aggression. the combinations of arena sizes (petri dishes of 6.0 and 9.0 cm) and temperatures (25 and 28 oc) were assessed for effects on intraspecific agonism. agonistic behavior was scored positive in arena if more than half of the starting number of termites was dead and injured after 17 hours. after the intraspecific encounters it was possible to delimitate three colonies from the five infestation points. no significant differential survival was seen in two different arena sizes and two different temperatures. these assays indicate that the factors governing the agonistic behavior in h. tenuis are complex and seems to be dependent on environmental conditions and individual characteristies (age, size and caste).
Electroantennographic responses of Heterotermes tenuis (Isoptera: Rhinotermitidae) to synthetic (3Z,6Z,8E)-Dodecatrien-1-ol
Batista-Pereira, Luciane G.;Santos, Márcio G. dos;Corrêa, Arlene G.;Fernandes, Jo?o B.;Dietrich, Célia R. R. C.;Pereira, Dilmar A.;Bueno, Odair C.;Costa-Leonardo, Ana Maria;
Journal of the Brazilian Chemical Society , 2004, DOI: 10.1590/S0103-50532004000300006
Abstract: the subterranean termite heterotermes tenuis (isoptera: rhinotermitidae) is a pest of great importance for the brazilian economy as it causes serious damages in commercial reforestations of eucalyptus spp. and sugarcane cultures. (3z,6z,8e)-dodecatrien-1-ol has been identified as a pheromone of some species of subterranean termites. the objective of this research was to synthesize (3z,6z,8e)-dodecatrien-1-ol and determine by electroantennographic (eag) bioassays the selectivity and sensitivity of h. tenius antennae to its whole worker extract and to the synthetic triene alcohol.
Popula??o e território de forrageamento de uma col?nia de Heterotermes tenuis (Hagen) (Isoptera, Rhinotermitidae)
Camargo-Dietrich, Célia Regina Rodrigues de;Costa-Leonardo, Ana Maria;
Revista Brasileira de Zoologia , 2003, DOI: 10.1590/S0101-81752003000300006
Abstract: heterotermes tenuis (hagen, 1858) is a subterranean termite that cause damage in forests, crops and urban areas. the population and foraging territory of an urban colony were determined using triple mark-release-recapture technique. foraging population was estimated in 134,583 ± 5,803 individuals. the foraging territory encompassed an area of 175,5 m2 and the maxim linear foraging distance was 36 m.
Popula o e território de forrageamento de uma col nia de Heterotermes tenuis (Hagen) (Isoptera, Rhinotermitidae)
Camargo-Dietrich Célia Regina Rodrigues de,Costa-Leonardo Ana Maria
Revista Brasileira de Zoologia , 2003,
Abstract: Heterotermes tenuis (Hagen, 1858) is a subterranean termite that cause damage in forests, crops and urban areas. The population and foraging territory of an urban colony were determined using triple mark-release-recapture technique. Foraging population was estimated in 134,583 ± 5,803 individuals. The foraging territory encompassed an area of 175,5 m2 and the maxim linear foraging distance was 36 m.
Nitriding using cathodic cage technique of martensitic stainless steel AISI 420 with addition of CH4
De Sousa, R.R.M.;De Araújo, F.O.;Da Costa, J.A.P.;De Sousa, R.S.;Alves JR., C.;
Matéria (Rio de Janeiro) , 2008, DOI: 10.1590/S1517-70762008000200012
Abstract: aisi 420 martensitic stainless steel samples were nitrided by cathodic cage technique with addition of methane in the atmosphere aiming to reduce chromium nitride precipitation, to increase hardness and wear resistance without the presence of characteristic defects inherent to the ionic nitriding process. microhardness measurements and x-ray analysis confirm the formation of a high hardness double-layer constituted by two regions: one internal region composed of carbon and another composed of nitrogen.
Oncocalyxone A: electrochemical, spectroscopic investigation and studies of its interaction with DNA, nucleobases and N-acetylcysteine
Costa, Cicero de O.;Costa, Erivaldo de O.;Ferreira, Fabrícia da R.;Viana, Luciana da S.;Silva, Leonardo V. da;Silva, Francisco de A. dos Santos;Abreu, Fabiane C. de;Figueiredo, Isis M.;Pinho Jr., Waldomiro;Bento, Edson de S.;Lemos, Telma L. G.;Pessoa, Otília D. L.;Aguilera-Venegas, Benjamin;Norambuena, Ester;Olea-Azar, Claudio;Goulart, Marília O. F.;
Journal of the Brazilian Chemical Society , 2012, DOI: 10.1590/S0103-50532012000600024
Abstract: the formation of paramagnetic species from oncocalyxone a in aprotic medium was confirmed by performing in situ electrochemical-electron spin resonance (e-esr) experiments. the high delocalization of the radical generated at the first reduction potential is clearly evidenced by the hyperfine coupling of h-9 with the larger coupling constant, besides the couplings at the h-3 (close to quinone) and h-7 (far from the quinone nucleus) positions. in protic medium, together with ph dependence experiments, oncocalyxone a showed to be dna-reactive through experiments with dna sensors. its reaction with n-acetylcysteine, with structural characterization of the addition products, proved its ability as michael acceptor. both aspects are important in terms of biological/pharmacological activities and indicate the present models as important tools in the screening of biologically active compounds.
Immunological properties of gene vaccines delivered by different routes
Oliveira, S.C.;Rosinha, G.M.S.;de-Brito, C.F.A.;Fonseca, C.T.;Afonso, R.R.;Costa, M.C.M.S.;Goes, A.M.;Rech, E.L.;Azevedo, V.;
Brazilian Journal of Medical and Biological Research , 1999, DOI: 10.1590/S0100-879X1999000200009
Abstract: gene vaccines represent a new and promising approach to control infectious diseases, inducing a protective immune response in the appropriate host. several routes and methods of genetic immunization have been shown to induce antibody production as well as t helper (th) cell and cytotoxic t lymphocyte activation. however, few studies have compared the nature of the immune responses generated by different gene vaccination delivery systems. in the present study we reviewed some aspects of immunity induced by gene immunization and compared the immune responses produced by intramuscular (im) dna injection to gene gun-mediated dna transfer into the skin of balb/c mice. using a reporter gene coding for ?-galactosidase, we have demonstrated that im injection raised a predominantly th1 response with mostly igg2a anti-?gal produced, while gene gun immunization induced a mixed th1/th2 profile with a balanced production of igg2a and igg1 subclasses. distinct types of immune responses were generated by different methods of gene delivery. these findings have important implications for genetic vaccine design. firstly, a combination between these two systems may create optimal conditions for the induction of a broad-based immune response. alternatively, a particular gene vaccine delivery method might be used according to the immune response required for host protection. here, we describe the characteristics of the immune response induced by gene vaccination and the properties of dna involved in this process.
Análise biomecanica ex vivo de um modelo de haste intramedular de polipropileno para osteossíntese em úmeros de bezerros
Marval, C.A. De;Alves, G.E.S.;Las Casas, E.B.;Costa, C.G.;Saffar, J.M.E.;Lago, L.A.;Carvalho, W.T.V.;Leal, B.B.;Faleiros, R.R.;
Arquivo Brasileiro de Medicina Veterinária e Zootecnia , 2011, DOI: 10.1590/S0102-09352011000200001
Abstract: a total of 12 pairs of humeri from male calves 15 to 30 days old were used. the left humeri remained unchanged and the right ones were fractured in the diaphysis between proximal and middle thirds. the fracture was fixed with a polypropylene intramedullary nail interlocked with two steel bone screws crossed along each segment. six pairs of bones were subjected to a compression test and the others to a flexural test using a universal testing machine. in the compression tests, the mean rupture loads were 738,3n and 473,3n, and in the flexural tests they were 322,4n and 117,9n for the intact and fractured bones respectively. fractured bones fixed with the proposed model were able to resist 66.4% of the load during compression and 36.6% during bending when in comparison to intact bones. fractured humeri treated with polypropylene intramedullary nail showed limited resistance compared to intact ones.
Plano amostral para cálculo de densidade larvária de Aedes aegypti e Aedes albopictus no Estado de S?o Paulo, Brasil
Alves,Maria Cecília G.P.; Gurgel,Sérgio de M.; Almeida,Maria do Carmo R.R. de;
Revista de Saúde Pública , 1991, DOI: 10.1590/S0034-89101991000400003
Abstract: the yellow fever and dengue vector control program developed by the superintendency for the control of endemic diseases in the state of s. paulo recommends aedes aegypti and aedes albopictus larval density monitoring in cities with domiciliar infestation. the sampling plan which has been applied in the countries of the presidente prudente region (sp- brazil) since 1987 is described. the infestation is measured by using the breteau index. a sample of buildings is drawn, monthly and independently, in the infested cities, in which measurements are to be made. the sample is stratified and the elementary unit selection is made by using two-stage cluster sampling: of blocks and buildings. the sample sizes were defined using the coefficient of variation and the intraclass correlation as estimated for towns covered by the regional health service of s. josé do rio preto. these sizes must be corrected periodically in accordance with the values of the breteau index and its variance obtained in previous months.
Structure and microstructure of coronary dentin in non-erupted human deciduous incisor teeth
Costa, Luciane R.R S.;Watanabe, Ii-Sei;Kronka, Márcia C.;Silva, Marcelo C.P.;
Brazilian Dental Journal , 2002, DOI: 10.1590/S0103-64402002000300005
Abstract: the dentin structure of non-erupted human deciduous mandibular and maxillary central and lateral incisor teeth was studied employing light and scanning electron microscopy. for light microscopy, nitric-acid-demineralized and ground sections were used. the sections were stained by hematoxylin-eosin, picrosirius and azo-carmim methods, and ground specimens were prepared using a carborundum disk mounted in a handpiece. for sem study, teeth were frozen in liquid nitrogen and fractured at longitudinal and transversal directions. structurally, demineralization and ground methods revealed tubules with primary and secondary curvatures, canaliculi, giant tubules, interglobular dentin, predentin, and intertubular dentin. scanning electron microscopy showed three-dimensional aspects of dentinal tubules, canaliculi, peritubular dentin, intertubular dentin, and predentin. this study contributes to knowledge about dentin morphology showing characteristics of teeth not yet submitted to mastication stress.
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